There is a bulletin concerning this issue.
Problem
Abnormal faint buzzing/crackling noise.
Solution
CAUSE: Transformer on the DCPS.
SOLUTION: Perform the following setting in Service Mode.
1. Enter Service Mode.
2. Select Machine.
3. Select Heater Control Level.
4. Set from Level 1 to Level 4.
5. Power machine OFF/ON.
I have tried this "fix" on several machines. It has actually solved the problem a couple times.
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